这是本来是一篇英文练习，后来加入了翻译。
Well , You all know well about p2p download software like emule, bitcomet for downloading the latest movies and games.
大家一定都对电驴，比特彗星之类的p2p下载软件非常熟悉，我们经常用他们来下载各种电影和游戏。
So, one day when one of our student said:"I think only when you can teach somebody one kind of knowledge and make him or her fully understand that, you truly master that knowledge " ，suddenly I came up this idea.
一天，当我们的一个学生说到“我觉得只有当你把一个知识能给别人讲明白了，你自己才是真正掌握了这个知识”的时候，我突然有了这个想法。
The knowledge structure of students is incomplete.some get block A and block B of knowledge while some get block A and block C.
学生们的知识结构是不完整的。有些人知道掌握了A部分和B部分，而另一些人掌握了A部分和C部分。
That seems alike what happened when different people are downloading the same file.这看起来非常像不同的人同时在下载一份文件。
Most blocks of two different students may overlap.So,if students who has already possessed the most blocks can be the knowledge download source like teacher, the workload of teachers will largely reduced.
两个不同学生的大部分知识结构是重合的。所以我们可以让掌握知识最全面的同学成为知识的“下载源”，那么老师的工作负荷将大幅减少。
The only thing they need to do is teaching the small amount of students who stand at the top of the pyramid.
老师只需要教会那些知识金字塔顶端的一小部分学生。
It looks like p2p download system we used everyday.Not only the burden of teachers will be much relieved , the students worked as a download source can really understand and master the knowledge while teaching other classmates.
这看起来非常像我们每天所用的P2P下载。不仅仅是老师的负担减轻了。通过教授其他同学，作为“下载源”的学生真正的理解并掌握了知识